Command - undo

- Migrated handleUndo to CmdUndo.

src/commands/CmdUndo.cpp

@@ -0,0 +1,54 @@
+////////////////////////////////////////////////////////////////////////////////
+// taskwarrior - a command line task list manager.
+//
+// Copyright 2006 - 2011, Paul Beckingham, Federico Hernandez.
+// All rights reserved.
+//
+// This program is free software; you can redistribute it and/or modify it under
+// the terms of the GNU General Public License as published by the Free Software
+// Foundation; either version 2 of the License, or (at your option) any later
+// version.
+//
+// This program is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+// FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+// details.
+//
+// You should have received a copy of the GNU General Public License along with
+// this program; if not, write to the
+//
+//     Free Software Foundation, Inc.,
+//     51 Franklin Street, Fifth Floor,
+//     Boston, MA
+//     02110-1301
+//     USA
+//
+////////////////////////////////////////////////////////////////////////////////
+
+#include <Context.h>
+#include <CmdUndo.h>
+
+extern Context context;
+
+////////////////////////////////////////////////////////////////////////////////
+CmdUndo::CmdUndo ()
+{
+  _keyword     = "undo";
+  _usage       = "task undo";
+  _description = "Reverts the most recent change to a task.";
+  _read_only   = false;
+  _displays_id = false;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+int CmdUndo::execute (const std::string&, std::string& output)
+{
+  context.disallowModification ();
+
+  context.tdb.lock (context.config.getBoolean ("locking"));
+  context.tdb.undo ();
+  context.tdb.unlock ();
+  return 0;
+}
+
+////////////////////////////////////////////////////////////////////////////////